Một thửa ruộng hình chữ nhật có nửa chu vi là 200m, chiều dài hơn chiều rộng 100m. Tính diện tích thửa ruộng ?

Giúp mik với Làm ơn Mik sẽ vote 5s Mik cần gấp lắm

Amparo Lasén, the Spanish sociologist who conducted the study found that Londoners use their cell phones the least in public. If they are with others, they prefer to let calls be answered by voice mail (a recorded message) and then they check for messages later. If the English do answer a call on the street, they seem to dislike talking with others around. They tend to move away from a crowded sidewalk and seek out a place (36) ________ they cannot be heard, such as the far side of a subway entrance or even the edge of a street. They seem to feel that the danger of the traffic is (37) ___________ to the risk of having their conversation be overheard. This has led to a behavior that Laser has called "clustering." At a busy time of day on the streets of London, you may find small crowds of cell phone users grouped together, each one talking into a cell phone. Even when it is raining—as it is often in London—people still prefer not to hold their conversations where others could hear. They talk (38) _____________ their umbrellas or in a doorway. In Paris, however, there are stricter rules about how and when to use cell phones. It is not considered polite to use a phone in a restaurant, (39) ______________, though it might be acceptable in the more informal setting of a café. One special custom that has developed in cafés seems unique to Paris. Young women often place their cell phones on the table beside them to signal that they are expecting someone. When the friend arrives, the phone is (40) _____________. In fact, the French are generally very disapproving of phone use in public and are quick to express that disapproval, even to strangers. (Adapted from “Advanced Reading Power” by Beatrice S. Mikulecky and Linda Jeffries) 36. A. which B. when C. where D. what 37. A. preferable B. prefer C. preference D. preferential 38. A. on B. under C. in D. after 39. A. for examples B. moreover C. nevertheless D. for instance 40. A. put away B. put back C. put down D. put aside

cạnh A dài 25 cm cạnh B dài 10 cm tại sao cạnh B lớn hơn

Ai giúp em với ạ em đang cần gấp

Cây rêu có cơ quan sinh sản giống cây hoa không? Vì Sao?

Cho m gam hỗn hợp Fe và Cu có khối lượng bằng nhau vào dung dịch Axit Sunfuric loãng dư, ta thu được 2,24 lít khí hidro và chất rắn A. Cho A tác dụng hết với dung dịch Axit Sunfuric đặc nóng thu được V lít lưu huỳnh đioxit ở điều kiện tiêu chuẩn. a) tính V b) đem Ag hỗn hợp trên vào dung dịch CuSO4 dư. Tính khối lượng chất rắn thu được sau phản ứng Giúp vs :(

Một ô tô trong ba giờ đầu đi 49km và 2 trong 5 giờ sau chạy 45km. Hỏi trung bình mỗi giờ ô tô đó đi được bao nhiêu km

Rewrite the sentences by another way 1. The storm had weakend when the rescue workers arrived in the area. => After.................................................................... 2. My father finished repairing our roof, then we went to help our neighbors after the storm last night. => Before my father............................................... 3. The area uninhabitable. The Chernobyl nuclear accident happened. ( Make ) =>.............................................................................. 4. Noise pollution happens. There is a change in animals' living pattern. ( causes ) =>.............................................................................. 5. They quickly send food and medical supplies to the victims of the typhoon. => Food and medical.............................................. 6. They are going to service our car by a mechanic tomorrow morning. => Our car is going................................................. mọi người ơi giúp mình với ạ Mình đang cần gấp ạ Mình cảm ơn nhiều ạ ^_^

Để thu được sinh khối vi sinh vật đạt hiệu quả cao nhất ta nên thu ơ pha nào